CN109519305A - Large-sized two-stroke uniflow scavenging formula gaseous propellant engine - Google Patents
Large-sized two-stroke uniflow scavenging formula gaseous propellant engine Download PDFInfo
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- CN109519305A CN109519305A CN201811082798.3A CN201811082798A CN109519305A CN 109519305 A CN109519305 A CN 109519305A CN 201811082798 A CN201811082798 A CN 201811082798A CN 109519305 A CN109519305 A CN 109519305A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B13/00—Engines characterised by the introduction of liquid fuel into cylinders by use of auxiliary fluid
- F02B13/06—Engines having secondary air mixed with fuel in pump, compressed therein without ignition, and fuel-air mixture being injected into air in cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
- F02B23/10—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder
- F02B23/104—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition with separate admission of air and fuel into cylinder the injector being placed on a side position of the cylinder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of large-sized two-stroke turbocharging uniflow scavenging formula internal combustion engines comprising: combustion chamber is limited by cylinder jacket (1), piston (10) and cylinder head (22)；Scavenging port (18) is disposed in cylinder jacket (1)；At least one exhaust valve (4), is disposed in cylinder head (22)；At least one fuel valve (30,31) is disposed in cylinder jacket (1) for gaseous fuel to be ejected into combustion chamber；And supply department, pressurized gaseous fuel (40) and gas-pressurized (44) without calorific value are supplied to the fuel valve (30) by it, and engine is configured as the gaseous fuel and the gas injection without calorific value through fuel valve (30,31) into the combustion chamber.
Description
Technical field
This disclosure relates to a kind of large-sized turbo-charging two-stroke internal combustion engine, the band run in particular with gaseous fuel
There is the large-sized two-stroke uniflow scavenging formula internal combustion engine of crosshead.
Background technique
Large-sized two-stroke turbocharging direct current boosting explosive motor with crosshead is for example for promoting large-scale ocean
Ship or as prime mover in power plant.Be not only due to absolute size, the construction of these two-stroke diesel engines with appoint
What its internal combustion engine is different.Their exhaust valve may weigh up to 400kg, and piston has the diameter of up to 100cm, and fires
Burning indoor maximum operating pressure is usually a few hectobars.Power involved in these high-pressure horizontals and piston size is huge.
It is rushed using the large size two that the gaseous fuel for the fuel valve injection averagely arranged by the length direction along cylinder jacket operates
Journey turbocharged internal combustion engine sprays gaseous fuel during the up stroke of the piston about started in exhaust valve closure
Engine, the mixture of gaseous fuel and scavenging in compression and combustion room and by time ignition means, such as, first
Oil Guide sprays to light.Therefore, the mixture of piston compressed fuel gas and scavenging, and therefore there is pinking (knock)
Risk.In the art, such pinking is referred to as " diesel engine " pinking.
It can be by ensuring the pressurization in combustion chamber (charge) as far as possible uniformly come the problem of reducing diesel knock.So
And because due to the fact that, the window that can be used for obtaining the cycle of engine of uniform-pressurizing is very short, so obtaining uniform
Scavenging and gaseous fuel pressurization are challenging: the part phase with cycle of engine available in such as four-stroke engine
Than wherein gaseous fuel and pressurized air can actually be in gas handling systems or at least in most of open hour of intake valve
Period usually mixes during 40-160 ° of crankshaft angles, from exhaust valve closure to top dead centre in the cycle of engine of (TDC)
Window is relatively small, usually 20-40 ° of crankshaft angles.
The relatively small window that can be used for obtaining the cycle of engine of uniform-pressurizing increases to avoiding large-sized two-stroke bavin
The challenge of diesel knock in oil turbine.
The non-homogeneous pressurization of indoor gaseous fuel and pressurized air of burning increases the risk of diesel knock, as a result may
Engine is caused badly damaged.
Previously have attempted to solve the problems, such as combustion knock in the following manner.
DK1779361 discloses a kind of large-sized DC scavenging type two-stroke engine, has the work moved in cylinder jacket
Plug, the cylinder head including exhaust valve and the scavenging port in cylinder jacket circumferentially.Some fuel injection valves are on scavenging port
Side is circumferentially distributed around cylinder jacket.Fuel is sprayed at least 90 ° of degree in crank angle before tdc.
DK1766118B1 discloses another large-sized DC scavenging type two-stroke engine, and wherein gaseous fuel is in scavenging port
Place is injected into the air in flowing in combustion chamber.In addition, spray nozzle is arranged at cylinder head.During compression, water quilt
It is ejected into combustion chamber to reduce the temperature of fuel/air mixture, to prevent pinking.
However, above-mentioned solution has shown that they are unsatisfactorily used to be effectively prevented large-sized two-stroke pressure
Fire the pinking in ignited internal combustion engine.
Therefore, it is necessary to improve the fuel injection in this big-block engine, to be effectively protected engine from by pinking
Caused damage.
Summary of the invention
Therefore, the purpose of the present invention is to provide one kind can prevent or at least reduce pinking using gaseous fuel operating
Large-sized DC scavenging type two-stroke engine.
Foregoing end other objects are realized by the feature of independent claims.According to dependent claims, specification and attached
Figure, further form of implementation is obvious.
According in a first aspect, providing a kind of large-sized two-stroke turbocharging uniflow scavenging formula internal combustion engine comprising: combustion
Room is burnt, is limited by cylinder jacket, piston and cylinder head；Scavenging port is disposed in cylinder jacket；At least one exhaust valve,
It is disposed in cylinder head；At least one fuel valve is disposed in cylinder jacket for gaseous fuel to be ejected into combustion chamber
In；And supply department, both pressurized gaseous fuel and forced air and/or exhaust are supplied to fuel valve, engine quilt
Be configured to via at least one described fuel valve by the gaseous fuel and the air and/or exhaust both and meanwhile be ejected into institute
It states in combustion chamber, to increase the momentum that at least one described fuel valve is ejected into the substance in combustion chamber.
Injection air and/or exhaust purpose be by spray do not change the substance being ejected into combustion chamber calorific value it is anti-
Answering property substance increases the momentum of the substance being ejected into combustion chamber.Increasing momentum improves the mixing of gaseous fuel and scavenging, this
Pressurization more evenly is generated in turn and reduces risk for knock.
Therefore, the air of injection and/or exhaust are reactive materials, but they do not change the substance being ejected into combustion chamber
The calorific value of (air and/or exhaust of gaseous fuel and injection).However, being generated by the air and/or exhaust of injection additional
Momentum increases the aggregated momentum of injecting substances, to reduce the risk of pinking or premature combustion.
Momentum is the product of quality m (kg) and speed v (m/s): m × v.
Therefore, the aggregated momentum for the substance being ejected into combustion chamber be injection quality of fuel multiplied by injection fuel speed
The product of degree and the air of injection and/or the quality of exhaust multiplied by the air of injection and/or the product of the speed of exhaust combination.
The speed of the gaseous fuel of injection is limited by velocity of sound.It is sprayed during injection events/each cycle of engine
Quality of fuel determined by engine loading.It is usually not that momentum is further increased after gaseous fuel has reached velocity of sound
It is possible.
However, the inventors have also recognized that can be by spraying air and/or row other than the gaseous fuel of injection
Gas increases momentum, to increase the quality of injection, and therefore increases momentum.Therefore, by spraying additional gas at a high speed
To increase momentum.
Inventor is also to be recognized that additional air and/or is vented the temperature for reducing pressurization gas in combustion chamber during compression
Degree, to further decrease the risk of pinking.
According to the first embodiments possible of first aspect, gaseous fuel and air and/or exhaust are fired from least one
Material valve is ejected into combustion chamber simultaneously as mixture.
According to the second embodiments possible of first aspect, at least one fuel valve internal mix gaseous fuel and sky
Gas and/or exhaust.
According to the third embodiments possible of first aspect, at least one fuel valve combined upstream gaseous fuel and
Air and/or exhaust.
According to the 4th embodiments possible of first aspect, engine includes for by air and/or exhaust and gas
Fuel is supplied to the common supply pipeline of at least one fuel valve.
It is sprayed according to the 5th embodiments possible of first aspect, while from the nozzle bore in the nozzle of at least one fuel valve
Emanate fluid fuel and air and/or hurst exhaust.
According to the 6th embodiments possible of first aspect, engine includes for air and/or exhaust is empty from pressurization
The source of gas source and/or exhaust be supplied at least one fuel valve separated supply line and for by gaseous fuel from pressurization
The source of gaseous fuel is supplied to the supply line of at least one fuel valve.
According to the 7th embodiments possible of first aspect, engine is same with gaseous fuel including being configurable for control
When the air sprayed and/or exhaust amount control unit.
According to the 8th embodiments possible of first aspect, engine includes above the periphery for being circumferentially distributed in cylinder jacket
At least one multiple fuel valve.
According to the 9th embodiments possible of first aspect, at least one fuel valve is provided with one or more injection sprays
Mouth.
According to the tenth embodiments possible of first aspect, at least one fuel valve, which is provided with, is connected to pressurized gaseous fuel
Source the first import and be connected to air and/or exhaust source the second import.
According to the 11st embodiments possible of first aspect, at least one fuel valve includes for by the gas in fuel valve
The fluid fuel device mixed with air and/or exhaust.
Preferably existed according to the 12nd embodiments possible of first aspect in piston towards during the stroke of cylinder head
After piston has passed through scavenging port, even more preferably at the exhaust valve closure moment or just the exhaust valve closure moment it
Before, start while spraying both gaseous fuel and air and/or exhaust.
According to the 13rd embodiments possible of first aspect, engine is provided with for preferably attached in tDC or TDC
The ignition system of nearly starting ignition.
According to the 14th embodiments possible of first aspect, engine is configured as the stroke in piston towards cylinder head
Period sprays both gaseous fuel and air and/or exhaust simultaneously.
According to second aspect, provide a kind of by improving gaseous fuel and scavenging in large-sized two-stroke turbocharging single flow
Come the method for reducing pinking, engine includes by cylinder jacket, piston and cylinder for mixing in the combustion chamber of scavenging internal combustion engine
It covers the combustion chamber limited, the scavenging port being arranged in cylinder jacket, the exhaust valve being arranged in cylinder head and is arranged in cylinder jacket
In for including by gaseous fuel and air and/or at least one fuel valve for being ejected into combustion chamber of exhaust, this method
Following steps: pressurized gaseous fuel and forced air and/or exhaust are supplied to fuel valve；And in piston towards cylinder head
Stroke during, by fuel valve by pressurized gaseous fuel and forced air and/or exhaust at the same be ejected into combustion chamber, with
Increase the momentum for the substance being ejected into combustion chamber.
Preferably only work as engine when engine loading is higher according to the first embodiments possible of second aspect
When load is greater than the 60% of the Continuous Maximum Rating of engine, and even more preferably only start when engine loading is greater than
The Continuous Maximum Rating of machine 70% when, only spray air and/or exhaust.
According to embodiment described below, these and other aspects be will be apparent.
Detailed description of the invention
In the part in detailed below of the disclosure, with reference to the accompanying drawings shown in the exemplary embodiment side of being explained in greater detail
Face, embodiment and embodiment.
Fig. 1 is the front view of large-sized two-stroke diesel engine accoding to exemplary embodiment,
Fig. 2 is the side view of the large-sized two-stroke engine of Fig. 1,
Fig. 3 be according to the diagram of the large-sized two-stroke engine of Fig. 1,
Fig. 4 is the sectional view of cylinder frame and cylinder jacket accoding to exemplary embodiment, and wherein the exemplary embodiment has
There are cylinder head and exhaust valve mounted thereto and the piston in both TDC and BDC be shown,
Fig. 5 is the partial cross-sectional view of the cylinder jacket of Fig. 4,
Fig. 6 is along the cylinder jacket of Fig. 5 according to the embodiment with fuel valve gear VI-VI ' sectional view, in the reality
It applies in example, the air and/or exhaust of gaseous fuel and injection are transported to combustion chamber by the same fuel valve,
Fig. 7 is the arrangement according to the embodiment for fuel supplies and fuel valve gear, in this embodiment, gas combustion
The air and/or exhaust of material and injection are mixed before being transported to fuel valve,
Fig. 8 is the arrangement according to the embodiment for fuel supplies and fuel valve gear, and gas fires in this embodiment
The air and/or exhaust of material and injection are mixed inside fuel valve, and
Fig. 9 is the curve graph for showing gas exchanges and fuel injection period.
Specific embodiment
It in the following detailed description, will be referring to the large-sized two-stroke low speed turbocharging ten in exemplary embodiment
Prefix internal combustion engine describes internal combustion engine.Fig. 1, Fig. 2 and Fig. 3 show the large-sized low-speed whirlpool with crankshaft 8 and crosshead 9
Wheel pressurization two-stroke diesel engine.Fig. 3 shows the large-sized low-speed turbocharging two-stroke with gas handling system and exhaust system
The diagram of diesel engine.In this exemplary embodiment, engine has four cylinders in line.Large-sized low-speed turbine
Pressurization two-stroke diesel engine usually has four in line that are carried by entablature 11 to 14 cylinders.Example
Such as, engine can be as the sustainer in ship or with the stationary engine of the generator operated in power station.Hair
Total output of motivation can be for example in the range of 1,000 to 110,000kW.
In this exemplary embodiment, engine is two-stroke direct current h type engine h, is had positioned at the lower part of cylinder jacket 1
Scavenging port 18 in region and the central discharge air valve 4 at the top of cylinder jacket 1.Scavenging from scavenging receiving portion 2 is worn
Cross the scavenging port 18 of each cylinder 1.From the fuel injection valve 30 in cylinder jacket 1 spray gaseous fuel and injection air and/
Or the air inlet of exhaust, the air of 10 compressed fuel gas of piston, injection in cylinder jacket 1 and/or exhaust and scavenging, it presses
It contracts and the igniting near tDC or its is by for example spraying guide oil (or any other conjunction from guide oil fuel valve 33
Suitable ignition liquid) it triggers, with after-combustion and generate exhaust.Such as the ignition system of laser ignition or glow plug can
Preferred form of this can also be used for starting ignition.
When exhaust valve 4 open when, exhaust flow through exhaust pipe associated with cylinder 1 enter exhaust receiving portion 3 in and
The turbine 6 that first exhaust pipeline 19 enters turbocharger 5 is flowed forward through, exhaust flows away from turbine 6, flows through second exhaust pipeline
Outlet 21 is flowed to by economizer 20 and is entered in atmosphere.Turbine 6 drives compressor 7 by axis, which passes through air inlet
12 are supplied fresh air.The scavenging of pressurization is transported to the scavenging pipeline 13 for leading to scavenging receiving portion 2 by compressor 7.Pipeline 13
In scavenging pass through intercooler 14 and cool down scavenging.
When the compressor 7 of turbocharger 5 does not convey enough pressure for scavenging receiving portion 2, i.e., in the low of engine
Under load or partial load conditions, cooling scavenging passes through the accessory fan 16 that is driven by electric motor 17, the auxiliary drum machine 16
It pressurizes to scavenging air-flow.In the higher situation of engine loading, turbocharger compressor 7 conveys sweeping for enough compressions
Gas, and then auxiliary blower 16 is bypassed via check-valves 15.
Fig. 9 is that scavenging port 18, the open hour of exhaust valve 4 and fuel valve 30 and closing period and degree in crank angle is shown respectively
Function curve graph.The curve graph shows that the window for spraying gaseous fuel is very short, to allow gaseous fuel and sweep
The time that gas mixes in a combustion chamber is very short.It is very short that the air and/or exhaust of gaseous fuel and injection are injected into this
Window in.
The air of injection and/or the amount of exhaust are very big, and the pressure of the air and/or exhaust sprayed is higher, to obtain
The relatively large quality sprayed under relatively high speed is obtained, to obtain the air of injection and/or the larger momentum of exhaust.
The momentum of the air of injection and/or the momentum of exhaust and the gaseous fuel of injection, which is combined to produce, to be significantly higher than individually
Gaseous fuel momentum aggregated momentum.
The air of injection and/or exhaust are reactive materials, but they do not increase any calorific value, and therefore, injection
The calorific value of substance into combustion chamber and the calorific value for the fuel being individually ejected into combustion chamber have no difference.
The amount of the gaseous fuel of each cycle of engine injection is determined by engine loading.Each cycle of engine is to be sprayed
Injection air and/or exhaust amount will depend on injection speed and prevent using certain types of gaseous fuel operation
The demand of the pinking of specific engines, and can be determined by simple trial and error.
Preferably, air and/or exhaust are sprayed for each cycle of engine.For low engine loading, usually exist compared with
Small risk for knock.Therefore, in embodiment, for high engine loading, for example, the Continuous Maximum Rating of engine
60-70% or more, only air and/or exhaust are injected into combustion chamber.
In embodiment, engine is provided with detonation sensor (not shown), and in response to from detonation sensor
The air of signal control addition and/or the amount of exhaust, that is, when knock is detected, increase the air of injection and/or the amount of exhaust
(quality) (and the air of injection and/or the amount (quality) of exhaust are reduced after a period of time when pinking is not detected).
In embodiment, the air of injection and/or exhaust with gaseous fuel as have gaseous fuel mixture simultaneously
Injection, or individually sprayed from gaseous fuel.
Fig. 4 and Fig. 5 and Fig. 6 shows the cylinder jacket for being generally designated as 1 for large-sized two-stroke engine with outside guide.Root
According to engine size, cylinder jacket 1 can be manufactured in different sizes, and wherein cylinder-bore is usually in the model of 250mm to 1000mm
In enclosing, and corresponding typical length is in the range of 1000mm to 4500mm.
In fig. 4 it is shown that cylinder jacket 1 is installed in cylinder frame 23, wherein cylinder head 22 is placed on cylinder jacket 1
Top, airtight joint portion is between cylinder head 22 and cylinder jacket 1.In Fig. 4, although lower dead center (BDC) and top dead centre
(TDC) obviously will not occur simultaneously, and by the 180 degree of crankshaft 8 rotate separate, but show by a dotted line in this two
Piston 10 in a position.Cylinder jacket 1 is provided with cylinder lubrication hole 25 and cylinder lubrication management line 24, when piston 10 passes through lubrication management
When line 24, the 24 supply cylinder lubricating oil of cylinder lubrication pipeline, then cylinder lubricating oil is distributed in gas by piston ring (not shown)
In the running surface of cylinder sleeve 1.
In the illustrated embodiment, the thinnest part of wall 29 is located at the bottom of cylinder jacket 1, that is, is located under scavenging port 18
At the part of side.The thick of the wall 29 of cylinder jacket 1 is located in the top of the axial length of cylinder jacket 1.Surrounding cylinder jacket 1
Axial length middle part cylinder jacket 1 thickness sharply transition be used as allow cylinder be shelved on the shoulder in cylinder frame 23
Portion.Cylinder head 22 is crushed on the upper surface of cylinder jacket 1 under the action of the biggish power applied by tensioning bolt.
Guide's oil valve 33 (usual each cylinder is more than one) is installed in cylinder head 22 and is connected to guide oil
Source (not shown).In embodiment, the timing of guide's oil spurts is controlled by electronic control unit (not shown).
Fuel valve 30 is installed in cylinder jacket 1, and wherein nozzle is substantially flushed with the inner surface of cylinder jacket 1, and is fired
Expect that the rear end of valve 30 is stretched out from the outer wall of cylinder jacket 1.In general, being the setting of each cylinder around the circumferentially equidistant liftoff distribution of cylinder
Three or four fuel valves 30.In embodiment, it is averaged fuel arranged valve 30 along the length of cylinder jacket 1.
Fig. 5 and Fig. 6 illustrates in greater detail cylinder jacket 1 and fuel valve 30.In this embodiment, there are four the settings of cylinder jacket 1
Fuel valve 30.Fuel valve 30 is radially shown in Fig. 6, but it is to be understood that fuel valve 30 can be relative to cylinder jacket 1 with another
Angle arrangement.
In embodiment, fuel valve 30 is connected to the air of gaseous fuel and injection and/or public (mixing) of exhaust
Supply department.Fig. 7 shows fuel valve 30 and is connected to the source of pressurized fuel 40 and the injection air of pressurization by single supply line 42
Both the sources of exhaust 44 and/or.Valve (not shown) is set to ensure to be transported to the gaseous fuel of fuel valve 30 and the sky of injection
Expectation ratio between gas and/or exhaust.Mixture is transported to nozzle 39 by common conduit 32.Mixture is from the nozzle in nozzle 39
Hole is injected into combustion chamber.Fuel valve 30 is provided with for for example spraying mixture timing under the control of electronic control unit
It is mapped to the device of combustion chamber.
In the modification of the embodiment of Fig. 7, the air and/or exhaust of gaseous fuel and injection are not mixed, but or
Gaseous fuel first otherwise injection air and/or exhaust be sequentially supplied to fuel valve 30 first and sequentially sprayed
It penetrates.
In another embodiment, as shown in figure 8, the source of gaseous fuel 40 is connected to fuel valve by dedicated supply line 41
Dedicated port in 30.Gaseous fuel is directed to the mixing point 33 in fuel valve 30 by pipe special 31.The air of pressurization and/or row
The source of gas 44 is connected to the dedicated port in fuel valve 30 by dedicated supply line 45.Pipe special 35 is by air and/or exhaust
The mixing point 33 being directed in fuel valve 30.In mixing point 33, gaseous fuel and air and/or exhaust are mixed, and mix
It closes object and nozzle 39 is transported to from mixing point 33 by common conduit 32.Nozzle 39 is provided with nozzle bore, and mixture passes through the spray
Nozzle aperture is injected into combustion chamber.Fuel valve 30 be provided with for for example under the control of electronic control unit by mixture timing
It is ejected into the device of combustion chamber.
In embodiment, forced air and/or exhaust are taken out from scavenging receiving portion (if engine is followed again using exhaust
Ring operation, then scavenging receiving portion includes the mixture of air and EGR gas).The air or gas taken out from scavenging receiving portion 2
The pressure of body is pressurized to suitable injection pressure by compressor (not shown).It is initially increased to spray from atmospheric pressure with air is made
Pressure is compared, and since the air or gas in scavenging receiving portion has been pressurized, air or gas is made to reach injection pressure
Required energy is less.
It has been combined various embodiments herein and describes various aspects and embodiment.However, passing through research attached drawing, openly
And appended claims, those skilled in the art are when practicing claimed theme, it is possible to understand that and realize disclosed implement
Other modifications of example.In the claims, word " comprising " is not excluded for other element or steps, and indefinite article " one " or
"one" is not excluded for multiple.The function of several stated in claim may be implemented in single processor or other units.?
State that the combination that only fact is not offered as these measures of certain measures cannot be used in mutually different dependent claims
Benefit.
Appended drawing reference used in claim is not necessarily to be construed as limitation range.
Claims (19)
1. a kind of large-sized two-stroke turbocharging uniflow scavenging formula internal combustion engine comprising:
Combustion chamber is limited by cylinder jacket (1), piston (10) and cylinder head (22)；
Scavenging port (18) is disposed in the cylinder jacket (1)；
At least one exhaust valve (4), is disposed in the cylinder head (22)；
At least one fuel valve (30,31) is disposed in the cylinder jacket (1) for gaseous fuel to be ejected into the burning
In room；And
Supply department, by pressurized gaseous fuel (40) and forced air and/or exhaust both (44) be supplied to fuel valve (30,
31),
The engine is configured as the gaseous fuel and the air via at least one described fuel valve (30,31)
And/or both exhausts are ejected into the combustion chamber simultaneously, are ejected into institute by least one described fuel valve (30,31) to increase
State the momentum of the substance in combustion chamber.
2. engine according to claim 1, wherein the gaseous fuel and the air and/or exhaust from it is described to
A few fuel valve (30) is ejected into the combustion chamber simultaneously as mixture.
3. engine according to claim 2, wherein the mixing gas combustion at least one described fuel valve (30)
Material and the air and/or exhaust.
4. engine according to claim 2, wherein the gas described in the combined upstream of at least one fuel valve (30)
Fluid fuel and the air and/or exhaust.
5. according to claim 1 to engine described in any one in 4, including for by the air and/or exhaust with
And the gaseous fuel is supplied to the common supply pipeline (42) of at least one fuel valve (30).
6. engine according to claim 1, wherein from the nozzle bore in the nozzle of at least one fuel valve (30)
The gaseous fuel and the air and hurst exhaust are sprayed simultaneously.
7. engine described in any one according to claim 1 to 3 or 6, including separated supply line, be used for by
The air and/or exhaust from the forced air and/or be vented (44) source be supplied at least one fuel valve (30,
31) and supply line, be used for by the gaseous fuel from the source of the pressurized gaseous fuel (40) be supplied to it is described at least
One fuel valve (30,31).
8. according to engine described in any one in preceding claims, including control unit, it is configurable for controlling
The amount of system and the gaseous fuel air sprayed simultaneously and/or exhaust.
9. according to engine described in any one in preceding claims, including being circumferentially distributed in the cylinder jacket (1)
Periphery above at least one multiple described fuel valve (30,31).
10. according to engine described in any one in preceding claims, wherein at least one described fuel valve (30,31)
It is provided with one or more injection nozzles (39).
11. engine according to claim 10, wherein at least one described fuel valve (30) be provided be connected to it is described
First import in the source of pressurized gaseous fuel (40) and be connected to the air and/or be vented (44) source the second import.
12. engine according to claim 11, wherein at least one described fuel valve (30) includes for by the combustion
Expect the gaseous fuel device mixed with the air and/or exhaust in valve (30).
13. according to engine described in any one in preceding claims, wherein in the piston (10) towards the gas
During the stroke of cylinder cap (22), preferably after the piston (20) has passed through the scavenging port, even more preferably exist
Exhaust valve (4) close moment or just before the exhaust valve (4) close moment starts to spray the gas simultaneously and fire
Both material and the air and/or exhaust.
14. being provided with according to engine described in any one in preceding claims for preferably in tDC or TDC
The ignition system of neighbouring starting ignition.
15. according to engine described in any one in preceding claims, wherein the engine is provided with pinking sensing
Device, and the amount of the air and/or exhaust in response to the signal control addition from the detonation sensor.
16. engine according to claim 15 is configured as when the detonation sensor detects pinking, increase
The air of injection and/or the quality of exhaust.
17. engine according to claim 16 is configured as when the engine in predetermined amount of time or predetermined quantity
In revolution, when the detonation sensor not yet detects pinking, reduce the air of the injection and/or the quality of exhaust.
18. a kind of by improving gaseous fuel and scavenging in the burning of large-sized two-stroke turbocharging uniflow scavenging internal combustion engine
The method for mixing to reduce pinking in room, the engine include:
Combustion chamber is limited by cylinder jacket (1), piston (10) and cylinder head (22),
Scavenging port (18) is disposed in the cylinder jacket (1),
Exhaust valve (4) is disposed in the cylinder head (22), and
At least one fuel valve (30) is disposed in the cylinder jacket (1) and is used for gaseous fuel and air and/or exhaust
It is ejected into the combustion chamber,
The described method comprises the following steps: by pressurized gaseous fuel and forced air and/or exhaust be supplied to fuel valve (30,
31)；And in the piston (10) towards during the stroke of the cylinder head (22), by the fuel valve (30,31) by institute
It states pressurized gaseous fuel and the forced air and/or exhaust while being ejected into the combustion chamber, be ejected into institute to increase
State the momentum of the substance in combustion chamber.
19. according to the method for claim 18, wherein preferably only starting when described when the engine loading is higher
When machine load is greater than the 60% of the Continuous Maximum Rating of the engine, and even more preferably only when the engine is negative
When carrying the 70% of the Continuous Maximum Rating for being greater than the engine, the air and/or exhaust are only sprayed.
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| CN202111435727.9A CN114278467A (en) | 2017-09-19 | 2018-09-17 | Large two-stroke direct-current scavenging type gas fuel engine |
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| DKPA201770703A DK179798B1 (en) | 2017-09-19 | 2017-09-19 | A large two-stroke uniflow scavenged gaseous fueled engine |
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| CN202111435727.9A Pending CN114278467A (en) | 2017-09-19 | 2018-09-17 | Large two-stroke direct-current scavenging type gas fuel engine |
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| Country | Link |
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| JP (2) | JP6721647B2 (en) |
| KR (1) | KR102181690B1 (en) |
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| CN111022209A (en) * | 2019-12-31 | 2020-04-17 | 天津轩云科技有限公司 | Two-stroke direct-flow scavenging engine |
| CN111636969A (en) * | 2020-06-05 | 2020-09-08 | 吉林大学 | Oil and gas supply control method and system for two-stroke dual-fuel engine |
| CN112081652A (en) * | 2019-06-13 | 2020-12-15 | 曼能解决方案（曼能解决方案德国股份公司）分公司 | Large two-stroke uniflow scavenging gaseous fuel engine and method for controlling conditions in a combustion chamber |
| CN112211720A (en) * | 2019-07-11 | 2021-01-12 | 曼能源解决方案公司(德国曼能源解决方案股份公司子公司) | Internal combustion engine |
| CN112211721A (en) * | 2019-07-11 | 2021-01-12 | 曼能源解决方案公司(德国曼能源解决方案股份公司子公司) | Internal combustion engine |
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| CN114746641A (en) * | 2019-12-06 | 2022-07-12 | 曼能源解决方案公司(德国曼能源解决方案股份公司子公司) | Internal combustion engine |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114278467A (en) | 2022-04-05 |
| JP2020122483A (en) | 2020-08-13 |
| KR20190032244A (en) | 2019-03-27 |
| DK201770703A1 (en) | 2019-04-03 |
| JP6721647B2 (en) | 2020-07-15 |
| JP2019056375A (en) | 2019-04-11 |
| KR102181690B1 (en) | 2020-11-24 |
| JP7291662B2 (en) | 2023-06-15 |
| CN109519305B (en) | 2022-03-29 |
| DK179798B1 (en) | 2019-06-26 |
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